Streaming services are convenient, but they remove you from the immersion with banner ads or subscription interruptions. Owning (on Blu-ray or as a digital purchase) allows you to experience the show exactly as it was meant to be seen: from the haunting opening monologue by Katara to the final frame of The Legend of Korra teaser.
Streaming versions (Netflix/Paramount+) lack most special features, but the show itself is the main event. avatar - the last airbender the complete series